package com.newcapec.lesson4;

public class Demo2 {
    public static void main(String[] args) {
        int[] arr = {123,3425,2134,7,3654,4,86,87,6523,36,54,756,123,23421};
        // n-1,n-2,n-3,n-4.....1
        //(n-1+1)*n/2
        //n*lgN


        //n
        //二分查找  排序
        //logN


    }
}
